   .. code-block:: html+jinja

      {% extends "!layout.html" %}

      {%- block extrahead %}
      {{ super() }}
      <script type="text/javascript">
      var gaJsHost = (("https:" == document.location.protocol) ? "https://ssl." : "http://www.");
      document.write(unescape("%3Cscript src='" + gaJsHost + "google-analytics.com/ga.js' type='text/javascript'%3E%3C/script%3E"));
      </script>
      <script type="text/javascript">
      try{
        var pageTracker = _gat._getTracker("UA-2431545-1");
        pageTracker._trackPageview();
      } catch(err) {}
      </script>"""
      {% endblock %}

      {% block footer %}
      {{ super() }}
      <div class="footer">This page uses <a href="https://analytics.google.com/">
      Google Analytics</a> to collect statistics. You can disable it by blocking
      the JavaScript coming from www.google-analytics.com.
      <script>
        (function() {
          var ga = document.createElement('script');
          ga.src = ('https:' == document.location.protocol ?
                    'https://ssl' : 'http://www') + '.google-analytics.com/ga.js';
          ga.setAttribute('async', 'true');
          document.documentElement.firstChild.appendChild(ga);
        })();
      </script>
      </div>
      {% endblock %}
